My seedling is about 10 days old and it started developing yeloow tips at the end of the leaves. I have not added any nutes as of yet. 5 gallon DWC
Yea, I'd say your probably right, other than the tip burn she looks good. Lower those temps and all should go well if your ph is regulated around 5.8, no higher for optimum uptake of nutrients, and make sure when you apply nutes your regimen includes Mn.